It's funny how much that extra 150 lbs made. My KLR weighs in at about 450lbs whereas my WRR (which I normally carry) weighs just under 300.
That night that the picture was taken I could notice the front end lift but it really wasn't that bad - still towed fine on the highway with crosswinds and down the gravel FSR to the OHV area.
It's definitely maxed out in this configuration. I've swapped generators for a smaller lighter one. That with the lighter bike in the back should bring it back level again. Pretty impressed with the truck though, handles it all fine and doesn't complain a bit.
I've done a scale stop before but this was without the bikes when I first got the trailer. Will definitely do so in the future to confirm everything. In my case, i f possible, I'll try to weigh each axle independently and then the whole rig, or at least the truck and trailer separately.